sysdeps/unix/sysv/linux/arm/linuxthreads/sysdep-cancel.h

   1 /* Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Phil Blundell <pb@nexus.co.uk>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21 #ifndef __ASSEMBLER__
  22 # include <linuxthreads/internals.h>
  23 #endif
  24
  25 #if !defined NOT_IN_libc || defined IS_IN_libpthread
  26
  27 /* We push lr onto the stack, so we have to use ldmib instead of ldmia
  28    to find the saved arguments.  */
  29 # ifdef PIC
  30 #  undef DOARGS_5
  31 #  undef DOARGS_6
  32 #  undef DOARGS_7
  33 #  define DOARGS_5 str r4, [sp, $-4]!; ldr r4, [sp, $8];
  34 #  define DOARGS_6 mov ip, sp; stmfd sp!, {r4, r5}; ldmib ip, {r4, r5};
  35 #  define DOARGS_7 mov ip, sp; stmfd sp!, {r4, r5, r6}; ldmib ip, {r4, r5, r6};
  36 # endif
  37
  38 # undef PSEUDO_RET
  39 # define PSEUDO_RET                                                     \
  40     ldrcc pc, [sp], $4;                                                 \
  41     ldr lr, [sp], $4;                                                   \
  42     b PLTJMP(SYSCALL_ERROR)
  43
  44 # undef PSEUDO
  45 # define PSEUDO(name, syscall_name, args)                               \
  46   .section ".text";                                                     \
  47     PSEUDO_PROLOGUE;                                                    \
  48   ENTRY (name);                                                         \
  49     SINGLE_THREAD_P;                                                    \
  50     bne .Lpseudo_cancel;                                                \
  51     DO_CALL (syscall_name, args);                                       \
  52     cmn r0, $4096;                                                      \
  53     PSEUDO_RET_MOV;                                                     \
  54   .Lpseudo_cancel:                                                      \
  55     MAYBE_SAVE_LR;                                                      \
  56     DOCARGS_##args;     /* save syscall args around CENABLE.  */        \
  57     CENABLE;                                                            \
  58     mov ip, r0;         /* put mask in safe place.  */                  \
  59     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  60     swi SYS_ify (syscall_name); /* do the call.  */                     \
  61     str r0, [sp, $-4]!; /* save syscall return value.  */               \
  62     mov r0, ip;         /* get mask back.  */                           \
  63     CDISABLE;                                                           \
  64     ldr r0, [sp], $4;   /* retrieve return value.  */                   \
  65     UNDOC2ARGS_##args;  /* fix register damage.  */                     \
  66     cmn r0, $4096;
  67
  68 # define DOCARGS_0
  69 # define UNDOCARGS_0
  70 # define UNDOC2ARGS_0
  71
  72 # define DOCARGS_1      str r0, [sp, #-4]!;
  73 # define UNDOCARGS_1    ldr r0, [sp], #4;
  74 # define UNDOC2ARGS_1
  75
  76 # define DOCARGS_2      str r1, [sp, #-4]!; str r0, [sp, #-4]!;
  77 # define UNDOCARGS_2    ldr r0, [sp], #4; ldr r1, [sp], #4;
  78 # define UNDOC2ARGS_2
  79
  80 # define DOCARGS_3      str r2, [sp, #-4]!; str r1, [sp, #-4]!; str r0, [sp, #-4]!;
  81 # define UNDOCARGS_3    ldr r0, [sp], #4; ldr r1, [sp], #4; ldr r2, [sp], #4
  82 # define UNDOC2ARGS_3
  83
  84 # define DOCARGS_4      stmfd sp!, {r0-r3}
  85 # define UNDOCARGS_4    ldmfd sp!, {r0-r3}
  86 # define UNDOC2ARGS_4
  87
  88 # define DOCARGS_5      stmfd sp!, {r0-r3}
  89 # define UNDOCARGS_5    ldmfd sp, {r0-r3}; str r4, [sp, #-4]!; ldr r4, [sp, #24]
  90 # define UNDOC2ARGS_5   ldr r4, [sp], #20
  91
  92 # ifdef IS_IN_libpthread
  93 #  define CENABLE       bl PLTJMP(__pthread_enable_asynccancel)
  94 #  define CDISABLE      bl PLTJMP(__pthread_disable_asynccancel)
  95 #  define __local_multiple_threads __pthread_multiple_threads
  96 # else
  97 #  define CENABLE       bl PLTJMP(__libc_enable_asynccancel)
  98 #  define CDISABLE      bl PLTJMP(__libc_disable_asynccancel)
  99 #  define __local_multiple_threads __libc_multiple_threads
 100 # endif
 101
 102 # ifndef __ASSEMBLER__
 103 extern int __local_multiple_threads attribute_hidden;
 104 #  define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
 105 # else
 106 #  if !defined PIC
 107 #   define SINGLE_THREAD_P                                              \
 108   ldr ip, =__local_multiple_threads;                                    \
 109   ldr ip, [ip];                                                         \
 110   teq ip, #0;
 111 #   define MAYBE_SAVE_LR                                                \
 112   str lr, [sp, $-4]!;
 113 #   define PSEUDO_RET_MOV                                               \
 114   RETINSTR(cc, lr);                                                     \
 115   b PLTJMP(SYSCALL_ERROR)
 116 #   define PSEUDO_PROLOGUE
 117 #  else
 118 #   define SINGLE_THREAD_P                                              \
 119   ldr ip, 1b;                                                           \
 120 2:                                                                      \
 121   ldr ip, [pc, ip];                                                     \
 122   teq ip, #0;
 123 #   define PSEUDO_PROLOGUE                                              \
 124   1:  .word __local_multiple_threads - 2f - 8;
 125 #   define MAYBE_SAVE_LR        /* lr already saved */
 126 #   define PSEUDO_RET_MOV PSEUDO_RET
 127 #  endif
 128 # endif
 129
 130 #elif !defined __ASSEMBLER__
 131
 132 /* This code should never be used but we define it anyhow.  */
 133 # define SINGLE_THREAD_P (1)
 134
 135 #endif